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Nature of Operations and Summary of Significant Accounting Policies - Computation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net income (loss)	$ 3,282	$ (99)	$ (716)	$ (3,191)	$ (2,127)	$ (2,784)	$ (1,160)	$ (5,736)	$ 12,866	$ 616	$ 1,217	$ (607)	$ (724)	$ (11,807)	$ 14,092
Weighted-average shares outstanding—basic (in shares)	40,252	39,936	38,926	38,247					33,522	33,024	32,786	32,377	39,341	35,811	33,083
Common stock equivalents (in shares)													0	0	2,454
Weighted-average shares outstanding—diluted (in shares)	41,635	39,936	38,926	38,247					36,251	35,610	34,815	32,377	39,341	35,811	35,537
Net income (loss) per share:
Basic (in dollars per share)	$ 0.08	$ (0.00)	$ (0.02)	$ (0.08)					$ 0.38	$ 0.02	$ 0.04	$ (0.02)	$ (0.02)	$ (0.33)	$ 0.43
Diluted (in dollars per share)	$ 0.08	$ (0.00)	$ (0.02)	$ (0.08)					$ 0.35	$ 0.02	$ 0.03	$ (0.02)	$ (0.02)	$ (0.33)	$ 0.40

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